If I recall correctly, whenever an new app is installed on the android device, a unix user and group correspond to the app will be created. So whenever the app writes to its own /data/data/(app identifier) folder, those file written will be owned by that specific app user.
However, when I try to look for those app users in /system/etc/passwd (if I remember correctly), they don't exist there. So I am wondering how does Android manage those app users?
